[libvirt] This patch mounts tmpfs on /run iff /run directory exists in libvirt-lxc containers.

[Daniel J Walsh]

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We do not want to share /run with containers in order to prevent information
leakage and applications within the containers attempting to communicate with
applications outside of the container.

It uses the same mount options used for /dev.

We also want to bind mount over /var/run directory since this will either be a
 symbolic link to /run but on some installations /run is bind mounted over
/var/run. If we just mount /run we are not guaranteed the /var/run will have
the same content.

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